Open new windows in a new tab: If you have a lot of sites open at the same time, a lot of windows can mean things get buried and are hard to find. I like opening new windows in a tab instead. Make sure to check this box in Preferences if you agree.

Warn me when closing multiple tabs: When you close a window with multiple tabs, Firefox asks “are you sure?” This prevents you from accidentally closing the whole window when you intended to only close the current tab, or gives you time to bookmark a page before shutting down Firefox so you don’t lose your place online.

Don’t load tabs until selected: You can keep your Firefox running fast by selecting the “don’t load tabs until selected” option. Firefox will only load the active tab when it starts or restores your previous session. The other open tabs will be loaded as you click on them.

For the advanced tab user, there’s also a Firefox Add-on that I find useful. Tab Mix Plus adds even more tab features to your browser. I like the ability to lock a tab, which means if I accidentally click on a link it will open it in a new tab, instead of overwriting the one I’m on. Check it out and see if it’s right for you.